delete a cachie,cookie and hiddenfield on button clickEvent in asp.net using c#?

This question makes no sense. You should try to post some code and explain your exact need. which means writing some code, not just copying and pasting our answers to create your project.

There's a cookies collection, you can add to it and delete from it, in your code behind. A hidden field is a control. If you set it to be Visible = false, it will not be rendered. I have no idea what a cachie is, but the browser cache is on the client side, you can emit code to try to clear it, but you can't clear it in C#.